This Duck samitum is held at the Cleveland Museum of Art. The piece is listed as measuring 3.25" x 4.45", which is quite small. Unfortunately, the museum does not list any information regarding the warp and weft or the twist direction of the threads.
The cloth features ducks encircled in floral roundels. and bands of a floral motif above the roundels. This is a slightly different design style than I have seen in other Sasanian textiles. It seems to combine elements from the tapestry designs with a unique floral roundel
Please see the link to the museum information to view the textile.